BSC%202010L%20INVERTEBRATES%20II

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BSC 2010LINVERTEBRATES II
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Principal Biological Concepts to Emphasize

• A. Protostome vs. deuterostome.
• B. Extremely diverse groups.
• C. Terrestrial adaptations of Arthropods.
• D. Serial homology.
• E. Evolution of flight.
• F. Metamorphosis.
• G. Detailed anatomy of the crayfish.

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Protostome vs. deuterostome.

• A. Mollusks and arthropods, as well as the
  Annelids we looked at last week, are protostomes.
• 1. Spiral and determinate cleavage
• 2. Blastopore (opening of the archenteron)
  becomes the mouth
• 3. Schizocoelous formation of the coelom
• B. We will look at deuterostome phyla next week
  (Echinodermata and Chordata)
• 1. Radial and indeterminate cleavage
• 2. Blastopore forms anus
• 3. Enterocoelous formation of coelom

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Early embryonic development
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Early development in protostomes and deuterostomes
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Phylum MOLLUSCA

• 1. Class Polyplacophora - chitons
• 2. Class Gastropoda - snails, slugs
• 3. Class Bivalvia - bivalves
• 4. Class Cephalopoda - octupus, squids

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Basic body plan of mollusks
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A chiton
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Garden snail
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The results of torsion in a gastropod
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Gastropods Nudibranchs (top left and bottom
left), terrestrial snail (bottom left), deer
cowrie (bottom right)
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A bivalve Scallop
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Anatomy of a clam
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Cephalopods Squid (top left and bottom left),
nautilus (top right), octopus (bottom right)
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Mussel heart xsec

• prepared (no. 11-1)

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Phylum ARTHROPODA

• 1. Subphylum Chelicerata
• a. class Merostomata - horseshoe crabs
• b. class Arachnida - spiders, ticks, scorpions
• 2. Subphylum Crustacea
• a. class Crustacea - aquatic arthropods - shrimp,
  lobsters, crabs, crayfish
• 3. Subphylum Uniramia
• a. class Insecta - flight
• b. class Chilopoda - centipedes
• c. class Diplopoda - millipedes

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Lycosid spider
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Arachnids. Scorpion (left), parasitic mites
inhabiting tracheae of honeybee (right)
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Horseshoe crabs, Limulus polyphemus
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External anatomy of an arthropod
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Insecta beetle
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Insect flight, dragonfly
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Metamorphosis of a butterfly
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Class Dipolopoda (millipedes)
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Malpighian tubules of insects
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Insect Malpighian tubules

• prepared (no. 11-2)

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Insect tracheae

• prepared (no. 11-3)

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Spider anatomy
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Grasshopper external anatomy and mouthparts

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Anatomy of a grasshopper, an insect
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Crayfish dissection

• A. WORK IN PAIRS.
• B. Photosheets are posted in lab.
• C. Dispose of crayfish in metal barrels in back
  of room.

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Insect identification - slides and dichotomous
key.

• A. You must identify five (5) insect orders
• B. Hand this in before leaving lab as data sheet
  2 (DS2 - 5 pts.)
• 1. Name
• 2. Slide box number
• 3. Slide number, insect order for each of 5
  slides.
• C. Key to insect orders
• D. Don't share slide boxes.
• E. For lab practical - Don't need to know orders
  or the structures used in the key.

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Suggest you view 33A Characteristics of
Invertebrates on Student Media CD-ROM for review.
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Lab practical in three weeks.

• A. Sign up sheets available on-line beginning
  Monday, October 10.
• B. Review lab sessions - Saturday October 15 and
  Sunday October 16.
• C. Practical exams - Monday October 17 through
  Wednesday October 19.
• D. 30 stations
• E. 1 question per station
• F. 60 seconds per station
• G. NO GOING BACK
• H. Practical covers labs 1, 4, 5 and 7, in
  roughly equal proportions.